Sometimes your drivetrain desperately needs cleaning, but you're simply not in the mood to break your chain. The CG-2 does a superb job making your chain, cogs, and chainrings spic-and-span while leaving everything on the bike. You get a CM-5 cleaning tool, GSC-1 brush, and eight ounces of Chain Brite. Simply pour some Chain Brite into the CM-5 and spin your crankset. The chain gets cleaned as it squeezes through the rotating brushes. Ground shipping only (you can't air freight Chain Brite).